Downloading Omnisphere 2.8 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. Omnisphere for Mac lies within Audio & Video Tools, more precisely Music Production. This Mac application was originally created by Spectrasonics.
From the developer:
Omnisphere is the flagship synthesizer of Spectrasonics - an instrument of extraordinary power and versatility. World Artists rely on Omnisphere as an essential source of sonic inspiration. The application brings many different types of synthesis together into one sounding instrument.
You may want to check out more Mac applications, such as Course For Omnisphere, which might be related to Omnisphere.